Advanced GHK Cu Neck & Face Serum Premium Quality Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with 50mg GHK Cu Vial Blue Copper Peptide Face Serum Age Aging Moisturizing Repairing for Skin Care Serum Facial Care Kit d One of my patients has shared this picture with me as she felt it was odd that this peptide had this very vivid blue colour, while her other peptides had a clear